James hemphill



(No Model.)

J. HEMPHILL.

MoLD.

Patented June Z6, 1888. Flan.

wrrNEssEs:

INVENTOR,

N. PEYERS. Phovn-L'nhognplmr. washington, D..

* UNITED STATES PATENT OFFICE.

JAMES HEMPHILL, OF PITTSBURG, PENNSYLVANIA.

MOLD.

SPECIFICATION forming part of Letters Patent No. 384,976, dated June 26, 1888.`

Application led April 10, 1888. Serial No.. 270,165. (No model.)

.To all whom. it may concern.-

Be it known that I, JAMEs HEMPHILL, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered a certain new and useful Improvementin Molds, of which improvement the following is a speciication.

The invention described herein relates to certain improvements in molds for forming articles having an irregular cross-sectional contour-such as shaped ingots-and saidin# vention has for its object a construction of mold whereby parts of the mold are rendered movable or yielding, so as to permit of the movement of projecting parts of the article, due to contraction ofthe metal in cooling and solidifying. It has heretofore beenA attempted to effect this object by forming the mold of metal, and so constructing certain parts thereof that they either yield under the pressure of the contracting metal, or to make such parts which is very finid when cast, will enter into the joints of such sectional mold, and'thereby either entirely prevent or so delay the movements of the parts of the mold as to defeat their purpose.

In general terms, the invention consists in the construction of molds, all as more fully hereinafter described and claimed.

In the accompanying drawings, forming a part of this specification, Figure 1 isa sectional elevation of a mold embodying my invention, and Fig. 2 is a horizontal section.

For convenience, the invention is described and shown as embodied in a mold for ingots having approximately the shape in cross-sec tion desired in the beam, or other structural shape to be produced by subsequent rolling or forging. rlhe matrix of mold consists of a thin sheet-metal shell backed or re-enforced by dry For convenience in construction, the shell is formed of a series of sections riveted or other wisesecured together. The shell or matrix of the mold is 'formedof thin metal sheets l and 2, each shaped to form one-halt' of the` Although the matrix, in the embodiment of 6o the invention shown in the drawings,is formed ot` two sheets of metal, it may be advantageous in forming molds for other articles to employ three or more sheets stamped or pressed to the required shape. formed is placed on a slab or plate, 3, of castiron within the tiask 4, and the space between the ask and shell is filled with dry sand or other suitable material of like yielding nature.

The sheet metal forming the shell should be made of sufficient thickness to lprevent the molten metal from burning through and coming in contact with thesand packing,bntshould not be so thick asto prevent its ready removal by burning oft' during the heating of the ingot for rolling, or that its incorporation into the ingot inrolling will have any effect upon the i character or quality of the metal of the ingot.

I claim herein as my invention j A mold for the production of articles having projections parallel,or approximately so,to its axis,consisting of a sheet-metal shell of a crosssectional contour corresponding to that of the article to be cast, and a backing of dry sand or other yielding material, whereby provision is made for the transverse yielding of the Walls of the mold as the metal solidities and con- 

